accumulate(
                         (
                             (1 - storage.loss_rate[t])
                             for t in range(
                                 t0,
-                                t0
-                                + tsa_period["timesteps_per_period"]
-                                - 1,
+                                t0 + tsa_period["timesteps_per_period"] - 1,
                             )
                         ),
                         operator.mul,
                         initial=1,
                     )